Hacked - need info

below is a snippet of my logs.  i believe somebody is trying to hack into my server.  i'm not sure if it succeeded or not.

my server is deny them access to the files requested by reporting error 404.  what is error 500?

what about the default.ida?  what is an ida file?

thanks.

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#Software: Microsoft Internet Information Services 5.0
#Version: 1.0
#Date: 2002-05-09 06:11:49
#Fields: time c-ip cs-method cs-uri-stem sc-status
06:13:41 202.98.62.200 GET /scripts/root.exe 404
06:13:42 202.98.62.200 GET /MSADC/root.exe 404
06:13:44 202.98.62.200 GET /c/winnt/system32/cmd.exe 404
06:13:44 202.98.62.200 GET /d/winnt/system32/cmd.exe 404
06:13:46 202.98.62.200 GET /scripts/..%5c../winnt/system32/cmd.exe 404
06:13:46 202.98.62.200 GET /_vti_bin/..%5c../..%5c../..%5c../winnt/system32/cmd.exe 404
06:13:47 202.98.62.200 GET /_mem_bin/..%5c../..%5c../..%5c../winnt/system32/cmd.exe 404
06:13:47 202.98.62.200 GET /msadc/..%5c../..%5c../..%5c/..Á../..Á../..Á../winnt/system32/cmd.exe 500
06:13:48 202.98.62.200 GET /scripts/..Á../winnt/system32/cmd.exe 404
06:13:48 202.98.62.200 GET /scripts/winnt/system32/cmd.exe 404
06:13:49 202.98.62.200 GET /winnt/system32/cmd.exe 404
06:13:49 202.98.62.200 GET /winnt/system32/cmd.exe 404
06:13:51 202.98.62.200 GET /scripts/..%5c../winnt/system32/cmd.exe 404
06:13:51 202.98.62.200 GET /scripts/..%5c../winnt/system32/cmd.exe 404
06:13:52 202.98.62.200 GET /scripts/..%5c../winnt/system32/cmd.exe 404
06:13:52 202.98.62.200 GET /scripts/..%2f../winnt/system32/cmd.exe 404
08:23:22 202.111.154.51 GET /default.ida 200
jchewAsked:
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jhanceCommented:
This is the NIMDA probing your system.  But you're mostly OK.  If the response is 4XX or 500, it's a FAILURE and nothing happened.

But you have the default.ida in place:

>>>08:23:22 202.111.154.51 GET /default.ida 200

FIX THIS NOW.  You don't need this file anyway, just DELETE it.

Be sure you are up to date on all Microsoft HotFixes for your version of Windows.
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jchewAuthor Commented:
btw, just fyi, i'm using Windows 2000 professional with IIS. i constantly check for updates at the ms update site and have applied all the latest SPs
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geoffrynCommented:
I agree with jhance.  The fact that your server returned 200 for default.ida is a BAD thing.  This just looks like a probe, if the log entry had looked like this:

08:23:22 202.111.154.51 GET /default.ida?XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 200


Then you might have a serious problem.
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jchewAuthor Commented:
i tried the following

http://my.server/default.ida

and got the following reply

The IDQ file default.ida could not be found.

does this mean i'm safe?  i have updated my win2k with all the ms critical updates.

btw, can you please tell me what is an ida file?

thanks.
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jhanceCommented:
It's a sample file that is included with IIS.  It is NOT needed for normal IIS web site operations and it is a known security risk.  Delete the file and be safe.
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jchewAuthor Commented:
thanks for the info...
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